Mortarboard hat balloon weight



FIG. 1 is a left side elevation view illustrating my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a mortarboard hat balloon weight, as shown.